V 



No. B 647.— November 1, 1921. 



PAGE 



The Development of Vegetation in the English Lakes, considered in relation to the 

 General Evolution of Glacial Lakes and Rock Basins. By W. H. Pearsall. 

 Communicated by A. G. Tansiey, F.R.S 259 



A Method for Investigating the H:einolytic Activity of Chemical Substances. By 



Eric Ponder. Communicated by Sir E. Sharpey Schiifer, F.E.S , 285 



Observations on the Effects of Fat Excess on the Gi'owth and Metamorphosis of 

 Tadpoles. By Robert McCarrison, M.D., D.Sc, LL.D., Lt.-Colonel I.M.S. 

 Communicated by Prof. C. S. Sherrington, Pres. R.S 295 



Experimental Researches on Vegetable Assimilation and Respiration. XIV. — 

 Assimilation by Submerged Plants in Dilute Solutions of Bicarbonates and of 

 Acids: an Improved Bubble-Counting Technique. By A. J. Wilmott. Com- 

 municated by Dr. F. F. Blackman, F.R.S 304 



No. B 648.— December 1, 1921. 



Observations on Reflex Responses to Rhythmical Stimulation in the Frog. By 

 Kanshi Sassa, M.D., Tokio. Communicated by Prof. C. S. Sherrington, 

 Pres. R.S 328 



On the Effects of Constant Galvanic Currents uj)(jn the Mammalian Nerve-Muscle 

 and Reflex Preparations. By Kanshi Sassa, M.D., Tokio. Communicated by 

 Prof. C. S. Sherrington, Pres. R.S .341 



On the Longevity of certain Species of Yeast. By Arthur R. Ling and Dinshaw 



Rattonji Nanji. Communicated by Sir Edward Thorpe, P.R.S 355 



On the Origin and Destiny of Cholesterol in the Animal Organism. Part XII. — On 

 the Excretion of Sterols in Man. By John Addyman Gardner and Francis 

 William Fox (Beit Memorial Fellow). Communicated by Prof. A. D. Waller, 

 F.R.S 358 



A Quantitative Analysis of the Growth of Heh'aatJms aiinuus. Part I. — The 

 Respiration of the Plant and of its Parts throughout the Life Cycle. By 

 Franklin Kidd, Cyril West (Research Workers, Food Investigation Board), 



and G. E. Briggs (Demonstrator in Plant Physiology, Botany School, 

 Cambridge). Communicated by Dr. F. F. Blackman, F.R.S 368 



Idio-Ventricular Periodicity. By D. H. de Soii/ca and J. A. Hewitt. Com- 

 municated by Prof. W. D. Halliburton, F.R.S 385 



OBITUARY NOTICES OF FELLOWS DECEASED. 



Paul Ehrlich i 



S. Schwendener viii 



Sir Thomas Richard Eraser (with portrait) xi 



Sir William Osier (with portrait) xvii 



John Gilbert Baker xxiv 



Charles Lajworth (with portrait) xxxi 



Leonard Doncaster (with portrait) xli 



Index Ixvii 



